First of all, call your carrier and ask nicely, if your contract has expired, they'll hopefully unlock your phone for you.
If you tell your carrier you'll be travelling and wish to use
a SIM card from another country to save on roaming fees, they may also unlock your phone for you.

It is important to note that not all devices are capable of being unlocked, often because of the manufacturers' device designs, and that even for those devices capable of being unlocked, not all device functionality may be capable of being unlocked. Specifically, devices manufactured with a SIM slot within the past three years (including, but not limited to, all Apple iPhone devices), cannot be unlocked to accept a different domestic carrier's SIM for use on another domestic carrier's network.

Samsung Galaxy Y TV S5367 Unlock Code Number

You can also unlock screen code and sim-card of Samsung Galaxy Y TV S5367 mobile phone. But you need to do first unlock code for it's operating system.

Samsung Galaxy Y TV S5367 Unlock Codes :

13324010/4002375

160030870/800623

171501125/1950693

165013720/1125203

165037730/1375623

37730623/13751650

If the unlocking code is not working for Samsung Galaxy Y TV S5367, you need to enter your phone IMEI number to the box to get new one.

Sample IMEI number : 4235/234234/23422

You might have to enter network settings (APN settings) for the new network, but usually 'big' network operators have an APN in the system software that will automatically be used. If you need to set a new APN, the people you bought your new SIM card from can help you. Don't worry, it's pretty easy.

Note:
Cell phone unlocking is now legal in the US. However, if you live in another country or are willing to be a rebel and flout a law everyone agrees should be changed, you can often unlock phones on your own without anyone's permission. The exact process will vary from phone to phone, so you'll have to perform a web search and find instructions for your specific mobile phone.